George l



(No Model.)

G. L. G-ILKEY.

- SPRING TOOTH HARROW. No. 250,065. Patented Nov. 29,1881.

N. PETERS. mo-Liflmgnphor. Washingmfl. D. c,

NrrE STATES PATENT F F ICE.

TAYLOR & 00., OF SAME PLACE.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 250,065, dated November 29, 1881. Application filed May 20, 1881. (No model.)

1 0 all whom it may concern:

Be it known that I, GEORGE L. GILKEY, a citizen of the United States, residing at Kalamazoo, county of Kalamazoo, State of Michigan, have invented new and useful Improvements in Spring-Tooth Harrows, of which the following is a specification.

My invention relates to the binding bar or casting for securing curved-shank spring harrow-teeth in their seats.

It has for its object a construction, substantially as hereinafter setforth, whereby the plate or bar securely holding the tooth causes the same to automatically control its degree of elasticity in its relation to the state of the soil, and at the same time all danger of thetooth breaking by conflicting with or bending over a sharp or angled edge of the commonly-eonstructed plates of this class is obviated.

In the drawings forming a part of this specification, in which similar letters of reference indicate like parts, Figure l is a side view of my construction; Fig. 2, top perspective of beam, having different styles of seats of the same class; Fig. 3, perspective of theiniproved binding plate or casting, and Fig. 4 a variation in constructing the same.

B is a tooth-beam, having curved seats consisting of eithera mortise in the beam, as at 'u, or a casting, d, secured to said beam and having seat 6 therein.

D is the tooth I design to use with my holder.

0 in Fig. '3 (below line h) represents the usually-constructedbinding barorcasting. In the use of such devices the tooth D frequently breaks at h, where it conflicts with the edge of the plate 0. To obviate this I form casting a with an upward-extending flange, a, curving it rearwardly from the tooth in the plane of a smaller circle than that of the seat and shank of the tooth. I throw the upper end of flange a rearwardly, so that the front face of said end will be in no plane in which the tooth portion adjacent to it will be thrown in the operation. This construction leaves a space, 1, between the tooth and flange a, which allows said tooth to spring rearwardly atthis point without bending over or conflicting with a sharp edge at h, but will bear against different points of the face of the flange, strain on the tooth.

In Fig. 4 downward-extending flanges m m are shown on casting c. This construction may be used with seat 0 orc,the object of the flanges being to line or face the seat each side of the tooth-shank.

In operating the harrow, should tooth D come in contact with an unusually hard strip of land it would be deprived of a large portion of its elasticity by conflicting with flange a, and danger of breaking the teeth, as before specifled, would be obviated.

That I claim, and desire to secure by Lett-ers Patent, is

1. The device for holding the barrow-tooth having a binding-plate provided with the upwardly-extending flange, substantially as set forth, to effect the objects specified.

2. The combination,substantiallyas setforth, of the tooth-holder having the bindingplate provided with the upwardly-extending flapge with the tooth adapted to antomatically'engage said flange, in the manner described.

i GEORGE L. GILKEY.

\Vitnesses:

FREDERICK A. TAYLOR, FREDK. LANDON.

according to the degree of 

